I've tried your suggestion and the errors still occur. However, I tried starting a new game and avoiding the 1st dialogue option, and was able to get past the zombies without a game crash.
After I passed the first room zombies seem safe to talk to, I'm safe for now I guess. I really don't know just what the hell happened though, some weird error of code?
I'll post any news that happens if it happens, thanks for your suggestion. Though if any more Mort/ghost lover crossovers happen again I'll probably actually buy the game.